Zilog Z16C30 Manual de usuario descargar pdf (Pagina 56)

4-7

Z16C30 USC

USER'S MANUAL

ZILOG

UM97USC0100

4.4 DATA FORMATS AND ENCODING

The USC’s Transmitter and Receiver can handle data in

any of the eight formats shown in Figure 4-4. The RxDecode

field in the Receive Mode Register (RMR15-13) controls

the format for the Receiver, and the TxEncode field in the

Transmit Mode Register (TMR15-13) controls it for the

Transmitter. The channel interprets both fields as follows:

xMR15-13 Data Format

000 NRZ

001 NRZB

010 NRZI-Mark

011 NRZI-Space

100 Bi-phase-Mark

101 Bi-phase-Space

110 Bi-phase-Level

111 Differential Biphase-Level

Non-Return-to-Zero (NRZ) mode doesn’t involve any en-

coding: at the start of each bit cell the transmitter makes

TxD low for a 0 or high for a 1. NRZB mode is similar except

that the transmitter and receiver invert the data: a low is a

1 and a high is a 0.

Figure 4-4. Data Formats/Encoding

NRZ

110010Data Bit:

NRZB

NRZI-Mark

NRZI-Space

Biphase-Mark

Biphase-Space

Biphase-Level

Differential

Biphase-Level

DPLL TxCLK (All Modes)

DPLL RxCLK (NRZ Modes)

DPLL RxCLK

(Biphase Modes)

Note: No assumption is made about the starting state of the serial data in this figure.

As a result, those encoding schemes that operate in terms of transitions rather than

levels are shown with dual traces corresponding to their two possible starting states.

UM009402-0201

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Zilog Z16C30 Manual de usuario Pagina 56

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